.content img {
  width: 100%;
}
.content .first_btn {
  background: url(http://oor4c3c8g.bkt.clouddn.com/one.gif) no-repeat;
  background-size: 100% 100%;
  height: 1.5rem;
  width: 100%;
}
.content .sec_btn {
  background: url(http://oor4c3c8g.bkt.clouddn.com/two.gif) no-repeat;
  background-size: 100% 100%;
  height: 1.5rem;
  width: 100%;
}
.content .three_btn {
  background: url(http://oor4c3c8g.bkt.clouddn.com/three.gif) no-repeat;
  background-size: 100% 100%;
  height: 1.5rem;
  width: 100%;
}
.content .four_btn {
  background: url(http://oor4c3c8g.bkt.clouddn.com/four.gif) no-repeat;
  background-size: 100% 100%;
  height: 1.5rem;
  width: 100%;
}
.content .five_btn {
  background: url(http://oor4c3c8g.bkt.clouddn.com/five.gif) no-repeat;
  background-size: 100% 100%;
  height: 1.5rem;
  width: 100%;
}